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Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light
Jia, HZ (Jia, Hanzhong); Chen, HX (Chen, Hongxia); Nulaji, G (Nulaji, Gulimire); Li, XY (Li, Xiyou); Wang, CY (Wang, Chuanyi); Wang, CY
2015
发表期刊CHEMOSPHERE
ISSN0045-6535
卷号138期号:11页码:266-271
摘要The photolysis of polycyclic aromatic hydrocarbons (PAHs) is potentially an important process for its transformation and fate on contaminated soil surfaces. In this study, phenanthrene is employed as a model to explore PAH photodegradation with the assistance of Fe(III)-smectite under visible-light while focusing on roles played by five low-molecular-weight organic acids (LMWOAs), i.e., malic acid, oxalic acid, citric acid, ethylenediaminetetraacetic acid (EDTA), and nitrilotriacetic acid. Our results show that oxalic acid is most effective in promoting the photodegradation of phenanthrene, while only a slight increase in the rate of phenanthrene photodegradation is observed in the presence of malic acid. Electron paramagnetic resonance experiments confirm the formation of (CO2-)-C-center dot radicals in the presence of malic and oxalic acid, which provides strong evidence for generating (OH)-O-center dot and subsequent photoreaction pathways. The presence of EDTA or nitrilotriacetic acid significantly inhibits both Fe(II) formation and phenanthrene photodegradation because these organic anions tend to chelate with Fe(III), leading to decreases in the electron-accepting potential of Fe(III)-smectite and a weakened interaction between phenanthrene and Fe(III)-smectite. These observations provide valuable insights into the transformation and fate of PAHs in the natural soil environment and demonstrate the potential for using some LMWOAs as additives for the remediation of contaminated soil.
关键词Low-molecular-weight Organic Acids (Lmwoas) Phenanthrene Smectite Visible Light Photodegradation
DOI10.1016/j.chemosphere.2015.05.076
收录类别SCI
WOS记录号WOS:000361772800037
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/4327
专题环境科学与技术研究室
通讯作者Wang, CY
作者单位Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Lab Environm Sci & Technol, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Xinjiang, Peoples R China;Xinjiang Univ, Sch Geol & Min Engn, Urumqi 830046, Peoples R China
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Jia, HZ ,Chen, HX ,Nulaji, G ,et al. Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light[J]. CHEMOSPHERE,2015,138(11):266-271.
APA Jia, HZ ,Chen, HX ,Nulaji, G ,Li, XY ,Wang, CY ,&Wang, CY.(2015).Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light.CHEMOSPHERE,138(11),266-271.
MLA Jia, HZ ,et al."Effect of low-molecular-weight organic acids on photo-degradation of phenanthrene catalyzed by Fe(III)-smectite under visible light".CHEMOSPHERE 138.11(2015):266-271.
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